"BANGKOK — As head of his village, Prajob Naowa-opas battled to save his community in central Thailand from the illegal dumping of toxic waste by filing petitions and leading villagers to block trucks carrying the stuff — until a gunman in broad daylight fired four shots into him.

A year later, his three alleged killers, including a senior government official, are on trial for murder. The dumping has been halted and villagers are erecting a statue to their slain hero.

But the prosecution of Prajob's murder is a rare exception. A survey released Tuesday -- the first comprehensive one of its kind - says that only 10 killers of 908 environmental activists slain around the world over the past decade have been convicted."